<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>外部样式</title>
    <!--链接外部样式-->
    <link href="css/index.css" rel="stylesheet">
</head>
<body>
   <div>2121212121</div>
   <p>323232dwcerverver</p>
</body>
</html>